Génis-Gálvez J M, Garcia-Lomas V, Prada F, Armengol J A
Anat Embryol (Berl). 1981;161(3):319-27. doi: 10.1007/BF00301829.
Among the types of horizontal cells of the avian retina, one has been described that has an axon terminating in a typical structure. The present study analyses the histogenesis of this axon whose initial outgrowth occurs on day 14 of incubation (HH-40). The axon terminal is first detectable, towards day 15 of incubation (HH-41), in the form of a varicose thickening possessing short filopodia. The formation of the axon and the growth of the axon terminal is coincident with a retraction of the perikaryal process. The axon usually originates from one of the principal dendrites and in these stages shows short and fine filopodia throughout its length. From day 16 onwards (synaptic) spines may be distinguished, both in the dendritic field and on the axon terminal. The growth of the axon, in the phase when the axon terminal still has not formed, may exhibit deflections and deviations in its course, the possible cause and mechanism of which are discussed.
在鸟类视网膜的水平细胞类型中，有一种已被描述，其轴突终止于一种典型结构。本研究分析了这种轴突的组织发生过程，其最初长出发生在孵化第14天（HH-40）。轴突终末最早在孵化第15天（HH-41）时可检测到，呈具有短丝状伪足的曲张增厚形式。轴突的形成和轴突终末的生长与胞体突起的回缩同时发生。轴突通常起源于一条主要树突，在这些阶段，其全长都有短而细的丝状伪足。从第16天起，在树突区域和轴突终末都可分辨出（突触）棘。在轴突终末尚未形成的阶段，轴突的生长在其行程中可能会出现偏转和偏差，文中讨论了其可能的原因和机制。
